102100111202021 has 4 divisors (see below), whose sum is σ = 102158755724844. Its totient is φ = 102041466679200.

The previous prime is 102100111201993. The next prime is 102100111202071. The reversal of 102100111202021 is 120202111001201.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 34013040484900 + 68087070717121 = 5832070^2 + 8251489^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102100111202021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102100111201987 and 102100111202005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102100111202071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29322258800 + ... + 29322262281.

It is an arithmetic number, because the mean of its divisors is an integer number (25539688931211).

Almost surely, 2^{102100111202021} is an apocalyptic number.

It is an amenable number.

102100111202021 is a deficient number, since it is larger than the sum of its proper divisors (58644522823).

102100111202021 is an equidigital number, since it uses as much as digits as its factorization.

102100111202021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58644522822.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 102100111202021 its reverse (120202111001201), we get a palindrome (222302222203222).

The spelling of 102100111202021 in words is "one hundred two trillion, one hundred billion, one hundred eleven million, two hundred two thousand, twenty-one".